US2785953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing a dry mixture of ammonium fluosilicate and silica
Assignee: WR Grace and Co
•
Filing: 1954-08-04
•
Granted: 1957-03-19
•
Expires: 1974-08-04
Abstract
No abstract record available.
Inventors
- 👤 Frederick T Fitch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:25
CPC Classifications
C; C05; C05B; C05B1/00; C05B1/02; C01; C01B; C01B33/00; C01B33/08; C01B33/10; C01B33/103
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A PROCESS FOR PREPARING A DRY MIXTURE OF AMMONIUM FLUOSILICATE AND SILICA WHICH COMPRISES ADMIXING SILICON TETRAFLUORIDE WITH AT LEAST TWO-THIRDS MOLE OF WATER VAPOR AND AT LEAST FOUR-THIRDS MOLES OF GASEOUS AMMONIA PER MOLE OF SILICON TETRAFLUORIDE AT TEMPERATURE ABOVE THE CONDENSATION POINT OF WATER IN THE GASEOUS MIXTURE AND BELOW ABOUT 300*C., THEREBY FORMING A DRY MIXTURE AND FINELY DIVIDED AMMONIUM FLUOSILICATE AND SILICA IN AN ATMOSPHERE FREE OF LIQUID WATER AND SEPARATING SAID DRY MIXTURE FROM SAID ATMOSPHERE ABOVE THE CONDENSATION POINT OF WATER.
Claim 2
Dependent Claim
87 words
A PROCESS FOR PREPARING A DRY MIXTURE OF AMMONIUM FLUOSILICATE AND SILICA WHICH COMPRISES ADMIXING SILICON TETRAFLUORIDE WITH AT LEAST TWO-THIRDS MOLE OF WATER VAPOR AND AT LEAST FOUR-THIRDS MOLES OF GASEOUS AMMONIA PER MOLE OF SILICON TETRAFLUORIDE AT TEMPERATURE ABOVE THE CONDENSATION POINT OF WATER IN THE GASEOUS MIXTURE AND BELOW ABOUT 300*C., THEREBY FORMING A DRY MIXTURE AND FINELY DIVIDED AMMONIUM FLUOSILICATE AND SILICA IN AN ATMOSPHERE FREE OF LIQUID WATER AND SEPARATING SAID DRY MIXTURE FROM SAID ATMOSPHERE ABOVE THE CONDENSATION POINT OF WATER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-18 | 1960-09-17 | 1961-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-18 | 1964-09-17 | 1965-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-18 | 1968-09-17 | 1969-03-19 | $7700.00 | Window Closed / Lapsed |